I have seen no evidence of that, really. You might assume he has issues, based on a few incidents in his past, but I have yet to hear a coach speak ill of him. He seems like a very together young man in interviews, that's for sure.
I do agree there should be concern because he is a one-year wonder.
And while I think the Bills need to repair other positions, I wouldn't be pissed if they took a top-level QB early in the draft. Probably not what I would do, but there are different valid approaches. If I was in charge and Newton or Mallett were available, I would be tempted.
I'm describing Joe Montana and Tom Brady, actually. Comparing Luck with Fitz only goes so far. They are both smart and confident. But Luck can throw the ball extremely well. He has no accuracy issues. If he were simply thought of as a "game manager" would be be considered the #1 QB available by nearly every draft expert?